Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.141..661m&link_type=abstract
Geophysical Journal International, Volume 141, Issue 3, pp. 661-671.
Astronomy and Astrophysics
Astronomy
2
Apparent Polar Wander, Avalonia, Continental Deformation, Palaeogeography, Palaeomagnetism, Silurian
Scientific paper
Palaeomagnetic data are presented from Mid-Silurian (Homerian, Upper Wenlock, ~425Ma) sediments from the Dingle Peninsula, SW Ireland, which forms part of the northern margin of the Palaeozoic microcontinent of Avalonia. Three remanence components were recognized. After removal of a low-temperature component (`L'), oriented parallel to the present Earth field at the sampling area, two higher-stability components were isolated: an intermediate-unblocking-temperature component (`I') with mean in situ D=196.9°, I=11.0°, α95=10.8, with a corresponding palaeopole at 330.0°E, 30.6°S (dp=5.6, dm=11.0), and a high-unblocking-temperature component (`H') with mean tilt-corrected D=218.6°, I=22.1°, α95=7.9, with a corresponding palaeopole at 309.5°E, 18.3°S (dp=4.4, dm=8.4). A primary (Wenlock) age is indicated for the `H'-component by a positive intraformational conglomerate test, whereas the `I'-component is thought to be a secondary mid-Carboniferous partial remagnetization. These data confirm that the sector of the Iapetus Ocean between Avalonia and Laurentia was essentially closed, within the limits of palaeomagnetic resolution, by the Wenlock. There is still, however, a discrepancy between the declinations recorded by similar-aged sequences to the north and south of the Iapetus Suture. These point to either an approximately 30° clockwise rotation of the entire Avalonian microcontinent relative to Laurentia during closure, or local vertical axis rotations of the sampling sites in southern Britain.
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